On property of interference sources, the shielding is divided into electronic shielding, magnetic shielding and electromagnetic shielding, then these shielding are studied in detail.

While shielding set of processing technology mainly divided into next makings shear, rolled plate forming, welding, straightening round, test and assembly several processes.

Damage be divided into two: one is a good set of stator shielding, and the occurrence of stator windings, the breakdown phase, the coil turn-to-turn short circuit, overload caused by burnt windings.